Fabrication and Characterization of CH 3 NH 3 PbI 3? x ? y Br x Cl y Perovskite Solar Cells

Atsushi Suzuki, Hiroshi Okada and Takeo Oku
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Atsushi Suzuki: Department of Materials Science, the University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan
Hiroshi Okada: Department of Materials Science, the University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan
Takeo Oku: Department of Materials Science, the University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan

Energies, 2016, vol. 9, issue 5, 1-11

Abstract: Fabrication and characterization of CH 3 NH 3 PbI 3? x ? y Br x Cl y perovskite solar cells using mesoporous TiO 2 as electron transporting layer and 2,2?,7,7?-tetrakis-( N,N -di-4-methoxyphenylamino)-9,9?-spirobifluorene as a hole-transporting layer (HTL) were performed. The purpose of the present study is to investigate role of halogen doping using iodine (I), bromine (Br) and chlorine (Cl) compounds as dopant on the photovoltaic performance and microstructures of CH 3 NH 3 PbI 3? x ? y Br x Cl y perovskite solar cells. The X-ray diffraction identified a slight decrease of crystal spacing in the perovskite crystal structure doped with a small amount of I, Br, and Cl in the perovskite compounds. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) showed the perovskite crystal behavior depended on molar ratio of halogen of Pb, I, Br and Cl. Incorporation of the halogen doping into the perovskite crystal structure improved photo generation, carrier diffusion without carrier recombination in the perovskite layer and optimization of electronic structure related with the photovoltaic parameters of open-circuit voltage, short-circuit current density and conversion efficiency. The energy diagram and photovoltaic mechanisms of the perovskite solar cells were discussed in the context of the experimental results.

Keywords: photovoltaic property; perovskite; solar cell; crystal structure; microstructure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
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